public function wsHandshake(HttpRequestInterface $request) { if ($this->verifier->verifyRequest($request) !== true) { return new HttpResponse(400); } return new HttpResponse(101, ['Upgrade' => 'websocket', 'Connection' => 'Upgrade', 'Sec-WebSocket-Accept' => $this->sign($request->getHeaderLine('Sec-WebSocket-Key'))]); }